Mounting assembly for magnetic deflection yoke

ABSTRACT

A nonmagnetic mounting assembly for maintaining a magnetic deflection yoke in predetermined relationship to the neck of a cathode-ray tube. The mounting assembly is capable of moving said yoke axially relative to the neck of said tube while maintaining a predetermined rotational and/or canted angular relationship between said yoke and neck and also presents the capability of adjusting the angular relationship between said yoke and neck without affecting the axial relationship.

United States Patent [72] Inventors Francis E. Ryder 3,302,050 l/l967 Obert et a1 3,321,577 5/1967 Burke et al. 3,330,979 7/1967 Constantine 3,404,228 10/1968 McLeod Island Lake; Julian V. Fisher, Carpentersville, both of, III.

Att0rneys-Robert W. Beart, Michael Kovac, Barry L. Clark S H r a H n e G m P m e a m H m R x k E m W J m d n m a C m m 7 9m o a T 1MB 51 0 3% 71] Q 08 mMmm AHPA III] [253 2247 [.111

Chicago, Ill.

[54] MOUNTING ASSEMBLY FOR MAGNETIC DEFLECTION YOKE 33/ 8 ABSTRACT: A nonmagnetic mounting assembly for maintaining a magnetic deflection yoke in predetermined relation- I-IOIf 1/00 [51] Int. ship to the neck of a cathode-ray tube. The mounting [50] Field 335/210, sembly is capable of moving 3a References Cited UNITED STATES PATENTS 2,424,513 7/1947 Stephan...

id yoke axially relative to the neck of said tube while maintaining a predetermined rotational and/or canted angular relationship between said yoke and neck and also presents the capability of adjusting the angular relationship between said yoke and neck without afiecting the axial relationship.

PATENTEU JUN 1 [9n SHEET 1 OF 6 Francis E. Hyde r Jul/an 1 Fisher PATENTEDJUN Han 3,582,848

SHEET 2 UF 6 NV/mm.

Francis E. Ryder Jul/an V. Fisher Their An in PATENTEU JUN 1 I97! SHEET 3 [1F 6 Their A II vs Francis E. Rydr Julian V. Fisher PATENTEU JUN 1 WI SHEET Q [1F 6 INVljN'lOR. Francis E Ryder By Jul/an 1 Fisher v 4 Inn- H nuuumnn: In 9 u Their AH'vs PATENTED JUN 1 I97| SHEET 5 OF 6 INVIiN'IOR. Francis E. Ryder Julian I! F isher Their A H 'ys PATENTEUJUN Han 3,582,848

sum 6 0F 6 Y Jul/an V. Fisher MOUNTING ASSEMBLY FOR MAGNETIC DEFLECTION YOKE BACKGROUND OF THE INVENTION In the electronics field, it is well known that cathode-ray tubes which are utilized for the projection of television images and particularly colored images require a plurality of correction devices, most of which are magnetic in nature and which are physically located on or near the neck of the cathode-ray tube for purposes of enlargement, alignment and centering of the image on the phosphorescent screen located on the interior surface of the face of the tube. Such devices can include a magnetic deflection yoke, radial convergence magnets, purity magnets, and in the case of color television tubes, a blue lateral shift mechanism. The present invention is concerned primarily with the mounting of the magnetic deflection yoke. Previously, such yokes were normally suspended from structures which were mounted on the chassis or cabinet of the receiver and difficulty was encountered in the maintenance of the deflection yoke in a predetermined angular relationship relative to the axis of the neck of the tube, particularly, when adjustments in the axial positioning of the yoke are made by an operator or vice versa. As can be recognized, tolerance variations are present from set to set and particularly where the yoke is suspended independently of the cathode-ray tube. Additionally, previous devices were so arranged that in order to make adjustments of the yoke, the entire yoke was freed of restraint and an attempt to make such axial adjustment to enlarge or decrease the size of the picture resulted in a rotational angular movement and/or a canting of the yoke relative to the axis which normally is undesirable dur ing such axial adjustment.

SUMMARY This invention is directed to a nonmagnetic mounting assembly for maintaining a magnetic deflection yoke in a predetermined relationship to the axis of the neck of a cathode-ray tube, i.e. a television tube. The mounting assembly is capable of moving the yoke axially relative to the neck of the tube while maintaining a predetermined angular relationship or adjusting the angular relationship while main taining the axial relationship between said yoke and neck during said adjusting movement. A primary object of the present invention is to provide a mounting assembly capable of carrying out the aforementioned functions.

Another object is to provide means for adjustably rotating the yoke in angular relationship in a plane perpendicular to the axis of the tube and to maintain such'angular relationship throughout all axial movement of the yoke.

A further object of the invention is to permit a predetermined skewing or canting of the yoke relative to the axis of the neck of the tube and to maintain such angular relationship through all axial movement of the yoke relative to the axis of the neck of the tube.

Still another object of the invention is to provide economical means for mounting a magnetic deflection yoke in a predetermined orientation or fixed relationship relative to the axis of the neck of a cathode-ray or television tube.

A further object is to provide means for mounting additional electronic components, i.e. radial convergence magnet assemblies, in spaced relation to said magnetic deflection yoke and in predetermined orientation relative to the neck of a television tube.

Further objects of the invention will be apparent to those skilled in the art when the following specification is read in conjunction with the drawing wherein:

FIG. 1 is an exploded perspective view of an embodiment of the present invention;

FIG. 2 is an elevational view of a clamp means in its initial condition for use with the embodiment shown in FIG. I;

FIG. 3 is an elevational view of the body means shown in FIG. 1;

FIG. 4 is a plan view of the body means as seen along line 4-4 of FIG. 3;

FIG. is a plan view and,

FIG. 6 is a side elevational view of the adjustment ring used in the embodiment of FIG. 1;

FIG. 7 is a side elevational view in partial section showing an embodiment of the present invention as it is being positioned on the neck of a television tube;

FIG. 8 is a side elevational view in partial section showing the same embodiment in final mounted position;

FIG. 9 is a side elevational view of a modification to the ad justment ring;

FIG. 10 is an exploded perspective view of another embodiment of the present invention;

FIG. 11 is an exploded perspective view of a modification to the clamping means for mounting the yoke in the assembly;

FIGS. 12 and 13 are side elevational views of the components making up the clamping means of FIG. I 1;

FIG. 14 is a plan view in partial section of an assembly mounting means of the type contemplated by the present invention;

FIG. 15 is a plan or end view of a modified form of the body making up the mounting structure;

FIG. 16 is a plan or end view of another embodiment to the present invention; and

FIG. 17 is a side elevational view in partial section of the embodiment as taken along line 17-17 of the end view in FIG. 16.

DESCRIPTION Referring now to the drawing wherein similar parts are designated by similar numerals throughout the drawing, a magnetic deflection yoke assembly 20 will include the magnetic deflection yoke 22, a nonmagnetic body or mounting means 24, an adjusting ring 28, a clamp means 30, and may if desired include a secondary workpiece 32.

Magnetic deflection yokes are well known in the art and generally include a ferrite core made up of one or more pieces and a multiplicity of windings internally of the core which generally assume an internal configuration substantially identical and complementary to the external surface configuration of the cathode-ray tube at the juncture of its neck with the cone or funnel portion of the tube. Externally, the yoke 22 generally has a bell-like configuration which flares out and provides an annular ring 36 of limited axial extent at one end, a tapered intermediate portion 38, an axially extending neck 40 and an annular apertured disc portion 42 at the end opposite of ring 36. The specific details of the construction of such a magnetic deflection yoke are not intended to be made a part of this invention other than the fact that the physical confirmation of such a yoke will determine the mounting means necessary. Normally the yoke encircles the neck of the television tube and is axially displaced a short distance from the surface of the funnel portion of the tube. Thus, the yoke is provided with a bore 44 which is adapted to telescopically accept the neck of the cathode-ray tube. Additionally, it is acceptable to provide means 46 spaced around the bore 44, in the present instance means 46 are a plurality of resilient fingerlike elements, which are adapted to grip the neck of the tube and to orient or center the tube relative to the axis of the neck.

The mounting means 24 for maintaining the yoke in a predetermined position includes an annular body'portion 50 adapted to encircle the yoke generally adjacent the annular ring portion 36. A plurality of inwardly directed resilient means 52 may be circumferentially spaced around the inner wall of the body 50 and are adapted to engage the outer periphery of ring portion 36 and to maintain it in a generally centered attitude relative to the axis of the annular body portion 50. In the present instance the resilient members 52 are in the form of a plurality of equally circumferentially spaced web means which are chordally arranged and integral with fixed points around the inner surface of body 50. The ring portion 36 is adapted to be gripped by these and the resilient members 52 tend to be radially depressed in the central portion thereof. Preferably the members 52 form a tangent to a circle slightly smaller in diameter than the ring portion 36 whereby the ring portion is firmly grasped and because of the resilient nature of members 52 they will distort sufficiently toaccept normal manufacturing variations in tolerance.

Extending axially from one end of body 50 are a plurality of circumferentially spaced pads or feet 58 which include an axially extending portion 60, and an outwardly diverging second portion 62 which is angularly disposed relative to the axis of body 50, and a third portion 64 which is substantially perpendicular to the axis of body 50, said third portion may if desired be apertured as at 66 for purposes best set forth hereinafter. The surface of second portion 62 is preferably provided with a coating of pressure sensitive adhesive 63, for purposes set forth hereinafter. Preferably, the included angle between the second portion and the axis of body 50 is slightly greater than the included angle between the funnel portion of the cathoderay tube and the axis of its neck for purposes best set forth hereinafter.

At the opposite end of body 50 there are provided a plurality of axially extending arm means 70 which are symmetrically disposed in circumferentially spaced fashion. The arms 70 include control means 72 which are in the form of axially extending slots extending a substantial portion of the length of arms 70 and extending axially through the body portion 50. To provide for the traversing of body 50 by means 72, there are provided an equal number of bridges or channel members 74 which project radially outwardly from body 50 and provide a passageway for theslot means 72 to axially traverse the body portion. Adjacent one end of bridge 74 is a circumferentially disposed flange means 76 which extends radially outwardly from the surface of arm 70 and has substantial circumferential extent to provide an outwardly directed shoulder facing away from body portion 50. Axially spaced from flange 76 and fixed to arm 70 is a tapered abutment 78 which terminates in a surface substantially perpendicular to slot means 72 adjacent its extremity and forms a shoulder 80 in opposition to the shoulder formed by the flange 76 for purposes which will be described hereinafter.

In the present embodiment the free ends of arms 70 are interconnected by a web means 86 which in this embodiment assumes the form of a cross to interconnect the illustrated four arms. Centrally of this web, which is substantially planer and perpendicular to the axis of the body portion 50, there is provided a central aperture 88 having a diametrical extent sufficient to accept the neck of the TV tube and to assist in the mounting of body 50 thereon. Adjacent to each of the arms 70 are fastening means 90 which provide an abutment or shoulder 92 in spaced opposition to the web 86. In the present instance the fastening means 90 is in the form of a plurality of resilient leg members which are tapered from their extremity to the presentation of the shoulder means 92. An equal number of resilient pads or fingers 94 may extend outwardly from web 86 to serve as a resilient foundation for support of an apertured secondary workpiece 32 when it is mounted in fixed relation relative to the resilient fastening means 90 and its associated shoulders 92. While the web 86 and shoulders 92 are sufiicient to serve as a mounting means for the secondary workpiece 32 the pads or fingers 94 will accommodate manufacturing tolerance variations in the thickness of the workpiece 32, shown in phantom in H6. 1 for clarity in illustration, the purpose which will be described hereinafter.

The body portion 50 preferably has the pads 58 and the anus 70 circumferentially spaced from one another so that the entire unit 24 can be formed or molded of a nonmagnetic material. It may be injection molded in a two plate mold for economy in manufacture from any of a wide variety of known materials such as polypropylene and may include filler materials such as fiberglas for reinforcement of the basic material to give the desired temperature, strength and rigidity characteristics necessary for the environment in which the device is to be utilized.

The adjusting ring 28 is nonmagnetic in nature and has a diametrical extent such that it is capable of being accepted in encircling relation to the arms 70. In the present embodiment the adjusting ring 28 has a plurality of slot means which are helically disposed relative to the axis of ring 28. Slots 100 are equal in number to the number of arms 70 and control means slots 72. Slots 100 must, at one end communicate with the edge of the ring 28. To accomplish this the slot 100 is provided with an axially extending portion 102 and the material of ring 28 at this edge is bent outwardly to form a flange 104 which forms a protective environment for the axial extension 102 as well as a locating means, as will be seen hereinafter. A second set of helically disposed slots are circumferentially spaced intermediate slots 100 for adjustment purposes which will be spelled out hereinafter. In the present embodiment the adjusting ring 28 is preferably formed in two or more segments of a nonmagnetic material, such as aluminum, and joined along their mating extremities, such as the overlap portion 112 by riveting or brazing the parts together. To facilitate operation of control ring 28 the free ends of the segments can be bent radially outwardly to form handle means 114. It will be recognized that other materials such as plastics or similar nonmagnetic materials can be utilized in the fabrication of the control ring 28, the choice of segmented aluminum rings is merely exemplary.

The last element of the assembly is the clamp means 30. This device is preferably an annular band which is split at 122 and has a pair of downwardly extending flanges at the free extremities of the ring 120 adjacent the split 122 to provide an access or clearance hole 124 in one flange and adjusting means such as screw threads 126 in the other flange. The screw threads 126 may be a helical impression in the sheet material, a staked nut or any other suitable means for adjusting the gap in the split 122. In the present invention, the control means is a helical impression 126 and a shoulder screw 128 having a relatively short threaded portion 130 and an unthreaded portion 132, with the unthreaded portion being slightly larger in diameter than the threaded portion to provide a shoulder 134 which will ride on and control the outer surface adjoining hole 124.

Extending radially outwardly in circumferentially spaced relation from the ring 120 are a plurality of antennalike arms 138 equal in number to the control slot means 72. The arms 138 preferably are provided with a reduced end portion 140 dimensioned to be acceptable within slots 72 and 100 and of sufficient length to radially travcrse'both slots simultaneously when the slots are in superposed relation. The arms 138 can be welded or riveted in position relative to ring 120. in the present embodiment one or more of the radially extending arms 138 preferably will include an adjustable clamp means 'which will cooperate with the adjusting ring 28 to prevent movement of the reduced portion 140 within the slots 100. in this embodiment such a device is provided by a radial extension 142 of the ring 120 and a perpendicular flange 144 having cooperable adjustment means, in the present instance a helical impression 146 and a wing screw 148 which will extend through slots 100 and control slot 72 to engage the helical impression 146. lt will be recognized that this is merely an economical approach and that the reduced portions 140 could be screw-threaded and a wingnut or other form of restraining means be utilized in cooperation therewith. In FIG. 1 the clamp means 30, for clarity and purposes of explanation, is spaced from the yoke 22. Its normal mounted position would be to have the ring portion 120 of clamp 30 encircling the neck 40 of the yoke and with the screw 128 adjustably fixing the clamp 30 relative thereto, as is generally shown in phantom in the yoke portion 22 of FIG. 1. As can be best seen in FIG. 2 the clamp ring 120 is provided with a peripheral flange 121 which is preferably reduced or eliminated in certain spaced segments of the clamp as at point 123 to provide bend or hinge points which will permit flexing of the clamp to facilitate its application to the neck of the yoke. The arm 142 can, if desired, be ribbed as at 143 to give it a rigidity equal to the studlike arms 138. It will be recognized that certain portions of the clamp 30 can be manufactured from plastic parts,

not shown, as long asthe functionalrelationship of parts is retained.

Referring now to FIGS. 7 and 8, the various elements are assembled in the .followingfashion. The clamp.30:is preferably initiallyassembled to the yoke by the yoke manufacturer. In 5 the shoulder formed by flange. 76. Thus, the control ring 28 is axiafly captured and restrained relative to the body 50 and associated arms 70 .but is free to rotate. The operator in the manufacturers assembly. line positions the yoke and its .associated clampagainst'the funnel or cone portion of the cathode-ray tubeby telescoping the yoke over the neck of the tube through bore 44. Since theinterior of yoke 22 is complementary to the cone or funnel portion of the tube and symmetrical therewith, engagement of the interior of the yoke against the cone or funnel will coaxially positionthe yoke in a positive manner, with the resilient members 46 centering the opposite 25v end relative to the neck; Holding the yoke in this positionand with the axial portions 102 of slots 100 in overlying relation to slots 72 at their juncture with bridges 70, the operator will axially telescope, the preassembly of the mounting portion 24 and the control ring 28 over the yoke. The, reduced portions 1400f arms 138 will pass through the slots 72 communicating with body 50 and bridge 74 until the reduced portions are positioned within the slot 100. ltshould be noted that prior to this time the operator will remove .a protective coating from the pressure sensitive adhesive on the underside of the outwardly diverging portions .62 of pads 58. As can be seen in FIG 7, when the reduced portionsl first. enter slots 100' through the axial extension 102, the pad members 58 are spaced from the. cathode-ray tube T." The operator, while 40 maintaining the yoke in its oriented relation, will rotate. the ring.28 which results in a relative, axial movement of the body 50 and the pads 58 in the direction of thefunnel portionbf the tube T until the inner edge of the pads come in contact with the tube. The operator then deflects the pads slightly inwardly and ibytapplication of pressure secures the yoke means by meansof theadhesive Q53 in a predetermined oriented condition relative to the .axis of the tube. Continued rotation :of the, ring 28.to thereduced portionl40 into th upper, ex-

tremity of slots I00 results in axial movement of the yoke 5 away frornthe cone or funnel portionof the tube along the axis of the. neck. The screw 148 is telescoped through slot 100 and then control means 72 into engagement with the threaded means 146.,Tightening, of the thumbscrew 148 presents further rotation of the ring .28 ;and locks the ,yoke in .av predeterminedaxial position along-the neck of the tube. 1 With the .body portion oriented initially by the physical configurationofthe yoke22-when it is placed over the neck-of thetubein the contact with .the cone or funnel portion of the tube fT"- resultsin a positive concentric or coaxial position of the mounting assembly. The control means or, slots 72 in cooperationwiththe arms 138 of theclamp 30 preclude unintentional rotation of the yokewhile permitting axial-adjustment thereof by rotation of the ring 28 ;whenclamping screw 148 is released. It is a single hand operation for an operator to adjust the z picture. size of the image on the cathode-ray-tube. 1n the event that .rotation of theyoke is desired, the elongated screw.1 28 which may bepro-vided with ,either a slot or other impression .forscrewdriyeroperation tor a thumbscrew for directmanual engagement, .can her-reached by communication throughthe supplementary slots 110 since .slots 110 have the samehelical angle as slots .1 00..The offset relation of screw 128 to the adjacentv arm 138 providesconstantaccess of screw 128 through the adjoining slots 1:10.

The operator can, at this point, telescope an apertured secondary workpiece over theneckof the tube into mounted relationship to the fastening means and web86. Such a secondary workpiece 32 can carryv the radial convergence magnets for the tube plus associatedcircuitry and may take the form of a printed circuit board which does not form a part of this invention except as to the means of mounting.

As a television setemploying this device moves down the assembly line, the checking operator would:

1. Rotate the adjustment ring 28 to move the yoke axially away fromv the cone portion of the tube. This'results in a small picture or test pattern in the centerof the screen.

2.- Then'turn off the blue. and green guns in the neckof the tube, in the case of a colored television tube.

3. Adjust the purity "centering magnets for what is commonly known as the "red ball" test where thered gun or its image is centeredin the tube.

4. Turn the blue and green guns'back on.-

5. Move the yoke forward towards thescreen by rotation of ring 28and fill thesereen to its optimum capacity and lock'the axialmovement component inposition by turning screw 148 to its locked position.

6. The clamp locking screw 128 which is reachable through the secondary slots ll0in ring 28 would be released and the yoke 22 would be rotated about its axis to level the picture relative to the margins of the screen.

7. Screw l28'would be tightened to clamp the yoke in this position.

8. Adjustment of the radialconvergence magnets which can be located on the secondary workpiece 32.

9. Adjustmentof the blue'lateral magnets so that the image follows an .optimum test pattern;

It will be appreciated thatother adjustment checks can be 5 made depending on the individual requirements of the manufacturer of the television chassis.

A variation to the aforementioned embodiment Iistheprovision of a third adjustment to mechanically compensate for what is known as blue width. This is done by tilting or canting the deflection yoke to correct blue aberration around the outer edges of the screen. Referring to FIG. 9, wherein similar parts are designated by similar numerals :with theaddition of the suffix a,." there is shown a modified ring 28a in which one of the slots 1000 is located in a moveable plate [50. Plate 150 has substantially the same radius of curvature as ring 28a;

The plate 150 superimposes a cutout portion of ring 280, not shown, to provide communication with slot a, The plate is maintained .in circumferential angular position by means of tabs 152 whichare struck from the material of ring 280 and override the outer surface of plate 150 while the parent material of ring 28a supports the under surface. An 'axially extending slot .154 is provided in plate 150 to accommodate an adjustment screw'l56 which threadedly engages a tapped hole or capturednut element in ring'28a, not shown.

' Byloosening the screw 156 .the operator can axially adjust plate 150 which results in movement'of one of the arms 138 while providing rotation of the deflection yoke along ,an axis formed .by :the arms 138 in adjacent quadrants to the arm accepted by slot 1000 with this axis being perpendicular to the axis of the tube neck. In this way the yoke-can be slightly tilted or canted relative to the tube axis. Once the adjustment has been made, the deflection yoke can be moved axially while maintaining its rotational attitudeand canted attitude fixed during such axial movement. It should be recognized, however, that similarly either the rotational attitude .or the canting 1 attitude can be modified and adjusted without changing'the axial position. Thus, the device as embodied 'herein has the ability to correct'one of the three directional components of position. of the deflection yoke without affecting the !other two components of movement;

Referring 3110.! to 'FIGS. 10 .through 14, there is shown further embodiment of the present invention,-wherein similar reference numerals .to designate similar parts shall be used 5 with the "addition .of the suflix -b." In this embodiment the basic components are substantially identical in function. In FIG. 10 the ring 28b has been telescopically assembled with the mounting assembly 24b. The arms 70b in this embodiment do not include the interconnectingweb-means 86 but rather a plurality of them are provided at their free extremity opposite the body portion 50b with an outwardly facing shoulder means 160 formed, in the present embodiment, by an inwardly directed flange. Integral with shoulder means or flange 160 is an upwardly and inwardly directedhook member 162. The hook means 162, in the present embodiment, are provided on the extremities of all of the arms 70b with the exception of at least one arm. In this embodiment the secondary workpiece 32b has a plurality of circumferentially extending slots 164, equal in number to the hook means 162 and terminating, at one extremity in an enlargement or keyhole portion 166 suitable in size to accept the hook means 162 when the secondary workpiece 32b is axi ally telescoped into mating relationship therewith. Rotation of workpiece 32b in a clockwise direction, as viewed in FIG. 10, results in the hook members 162 overlying the outer surface of workpiece 32b to retain the workpiece in axial restrained mounted relation withthe opposite surface against the flange shoulder means 160. At least one free extremity of an arm 70b is provided with a similar inwardly directed flanged shoulder means168 which carries means to fixedly restrain workpiece 32b. In the present embodiment this includesascrew 170 and an aperture 172 adapted to complementarily accept the screw 170. The secondary workpiece 32b is provided with additional slot means 174 adapted to permit telescopic communication between the screw 170, slot means 174 and aperture 172. If desired, resilientprotuberances 176 can be provided on shoulder means 168 to act as a resilient cushion or takeup to the action of screw 170.

Secondary workpiece 32b can be a printed circuit board adapted to mount radial convergence magnets 180 around the central aperture 88b which is adapted to accept the neck of the cathode-ray tube. This arrangement permits the positive location of the radial convergence magnets in fixed axial relationship relative to the neck ofthe tube. Dependent upon the specific design of cathode-ray tube involved, the length of the arms 70b can be controlled to positively locate the radial convergence magnets 180 relative to the neck in view of the posi tivemounting of the body 50b in specific relation to the cone or funnel portion of thetube.

ln the present embodiment of the invention the clamp means 30b includes an inner clamp 190 and an outer clamp 200. The inner clamp 190 is generally a split resilientlmetallic ringhaving a plurality of radially outwardly directed flange means 192 circumferentially spaced along the opposite edges of the clamp 190. Adjacent the split there are provided a pair of flanges 194 and 196 which are provided with means to adjustablyconstrict'the opening of spacing between the flanges. In the present embodiment this takes the form of a stamped impression in flange 194, a pass-through hole in 196 and an adjusting screw in. 198. As can be seen in FlG..12, the ring, which initially is in opened position, can be readily assembled with the neck portion 40 of the magnetic deflection yoke and generally is applied by the manufacturer of that device to constrain and maintain a split ferrite core of the deflection yoke in its desired assembled relationship. The outer clamp 200 includesa split ring 202 having an interrupted radial flange 204 extending'outwardly from the opposite edges of ring 202. A plurality of radially extending arms l38b carrying reduced portions 1401) at their extremities are fixedly mounted relative to ring 202. In the present embodiment the elongated arm or flange 142b, adapted to carry adjusting screw 12812 and wing screw 148b is hinged at point 123b, as in the earlier embodiment. Similarly,*the flange'carrying the threaded impression 126b is also hinged, to facilitate assembly, at point l23b. The arm 142k is provided with reinforcing flanges 206 along opposite edges which are connected to the adjacent edge of ring 202 and the flange l26b is similarly reinforced by flanges 208, along opposite edges, which are also integral with the adjacent segment of ring 202. Arm 142b and flange l26b terminate short of their juncture with the ring 202 to provide apertures 210 and 212 respectively, for purposes best set forth hereinafter. 7

Referring now to FIG. 11, the inner ring 190, which has been afiixed to the neck of the deflection yoke, which is not shown for purposes of clarity in illustration, is adapted to accept the outer clamp 200 in embracing relation thereto. The axial length of ring 1 is slightly greater than the axial length of ring 200 so that clamp ring 200 is adapted to be accepted within the axial confines of radially extending flanges 192 of the inner ring 190. The outer clamp 200 thus is axially fixed relative to the neck of the deflection yoke, however, release of the screw 12811 permits rotational adjustment of the outer clamp relative to the inner clamp while maintaining its axial relationship. The apertures 210 and 2l2 permitthe inner ring flanges 194l96 to pass therethrough and will tolerate limited rotational adjustment relative to the outer ring without adjustmentof the screw 198 and total rotational release of the deflection yoke.

H6. 14 shows the axial, or end view relationship of the deflection yoke 22b, when taken in section along neck portion 40b, in relationship to the radially extending arms 138k and the control ring 28b. It can be seen that the adjusting screw l28b which normally is attainable by communication with slot b can alternatively extend all the way through slot 11% and be provided with a winged head for manual manipulation or alternatively could have a lesser length and be provided with a driving means which would be accessible by a screwdriver extended through slot 11%. The reduced portions b form a shoulder with the arms l38b which when taken in combination with the flange 144b accurately spaces the radial positioning of the adjusting ring. Thus, loosening of wing screw 148b permits rotation of the adjusting ring 128b to axially movethe deflection yoke while maintaining the rotational attitude of the deflection yoke fixed relative to the neck of the cathode-ray tube. Looseningof screw 12812 permits rotational adjustment of the deflection yoke 22b without disturbing the axial adjustment and of course the provision of a movable plate in ring 28b will provide the third dimension'of adjustment; namely, tilting or canting relative to the tube axis.

A modification to the present invention canbe found in the embodiment shown in FIG. 15, wherein similar numerals will be used to identify similar parts with the addition of the suffix c."ln this embodiment the body 50c is provided with resilient members 52c which are bridgelike or channeledshaped in construction rather than being the chordal configuration found in the initial embodiment. The web means 860 is connected to the freeend of each arm member 700 and is enlarged in a central area to form a roughly triangular configured portion 220. This enlarged portion 220 carries three resilient engaging means90c for mounting the secondary work member, not shown, in juxtaposed relation to the web means 866. Further, in this embodiment the aperture 880 for acceptance of the neck of the television tube is generally square in configuration and is relieved adjacent each side by a slot 222 which forms a resilient portion adapted to be distorted and conform to the shape and size of the neck of the TV tube. With these variations this embodiment would be utilized and operate in the same fashion as the previous embodiments.

The final embodiment disclosing the teachings of the invention is shown in FIGS. 16 and.17, wherein similar numerals will be used to identify similar parts with the addition of a suffix d." in this device the mounting assembly includes a body 50d annular in configuration and adapted to encircle one extremity 36d of the magnetic deflection yoke 22d and to support same by a plurality of circumferentially spaced resilient means 52d. Extending outwardly in diverging relationship from the same end of the body 50d are a plurality of circumferentially spacedleg or pad members 58d. Members 58d include an axially extending portion. 60d; a diverging portion 62d and an adhesive material 63d which is pressure sensitive in nature and is vlocated on the outwardly facing surface of the diverging portions 6,2dfor engagement with the cone or funnel portion of the tube as has been previously explained.

The body 504 includes a plurality of circumferentially spaced axially extending arm members 70d which have a control means 72d integral therewith. In the initial embodiment disclosed the control means 72 was in the form of an axially extending slot whereas in the present instance the control means 72d is in the form of an axial extension of the arm 70d which is bladelike in configuration for purposes best set forth hereinafter. Extending radially from each of the arms 70d is a stud means 240 adapted to accept a complementary nut 242 which in the present instance is in the form of a wingnut. The control ring 28d includes a plurality of helically disposed slot means 100d communicating with an axially extending slot portion 102d, with portion 102d also communicating with one edge of the ring 28d to facilitate assembly of ring 28d with the studs 240 which are adapted to project radially through the slot 100d. In the present embodiment the adjusting ring 28d may be fabricated of plastic material and to facilitate econo mies in the injection molds it is found desirable to offset a portion 250 of the ring forming the lower edge of slot 100d to permit use of a two-plate mold in fabrication of the adjusting ring 28d. Thus, to insure a radial compression by nut 242 it is necessary to employ a stepped washer 252 between the ring 28d and the nut 242.

Adjacent the edge opposite the axial slot portion 10211, the ring 28d is provided with an inwardly directed flange 260 which is segmental in nature and is opposed by an inwardly directed spaced flange 262. in the present embodiment there is disclosed a pair of circumferentially opposed flanges 260 which traversed two opposed quadrants while the axially spaced flanges 262 occupy the remaining two opposed quadrants. It will be recognized that the configuration is conducive again to a two-plate molding operation and similarly the specific number of segments utilized is not a controlling factor. The spacing between adjoining segments also can be varied.

Positioned between the opposed flanges 260 and 262 is a nonmagnetic annular ring 270 which is adapted to encircle the magnetic deflection yoke 22d and to serve as a supporting means for the yoke. The ring 270 is provided with a plurality of circumferentially spaced slots 272 equal in number and complementary tov the bladelike control means 72d. Thus, with the bladelike control means 72d being fixed relative to the arm 70d, the ringlike plate 270 is capable of axial movement relative to the control means 72d, when the control ring 28d is rotated and its helical slots are moved relative to the posts or studs 240, resulting in a relative rotation between the plate 270 and the inwardly directed flanges 260-262 of the ring 28d.

The magnetic deflection yoke 22d is associated with the plate 270 by the clamp means 30d. Clamp means 30d include a split ring 120d encircling the neck portion d of the dcflection yoke 22d and has two or more radially extending arms 280 which are provided at their free extremities with a screwthreaded means 282 for cooperation with an adjusting screw 284. The annular plate 270 is provided with an equal number of circumferentially spaced slots 286 which are adapted to permit rotational adjustment of the deflection yoke by movement of screw 284 within slot 286.

Thus, rotation of the control ring 28d results in an axial movement of the deflection yoke carried by the platelike annular ring 270 and is restrained against rotation by the bladelike control means 72d. Tightening of the not 242 will positively position the yoke 22d in fixed axial relationship to the neck of the television tube. Angular adjustment of the yoke is of course carried out without axial movement thereof by loosening the screws 284 and rotating the yoke within the limits of slots 286.

While other embodiments of this invention will be apparent to thoseskilled in the art it is our intent to be limited only by the appended claims. l claim:

1. A deflection yoke assembly including a magnetic yoke, means formounting the yoke relative to the axis of the neck of a cathode-ray tube, means to adjust the rotational angular position component of said yoke relative to said axis, means to axially adjust the axial position component of said yoke relative to said axis, said rotational angular and axial adjustment means being adapted to maintain the yoke in a fixed relationship relative to said axis during adjustment of the other components of position thereof, said mounting means including an annular nonmagnetic body and a plurality of pad members symmetrically disposed and extending axially outwardly in diverging relation to one end of said body and adapted to engage and fasten said mounting means to said tube in symmetrical arrangement around the neck of said cathode-ray tube, said means to axially adjust said yoke including a plurality of arms integrally extending from said body in an axial direction opposite said pad members, said arms including axially extending control means, an annular nonmagnetic means rotatably mounted on in juxtaposed relation to said arms and axially fixed relative thereto, a plurality of helically disposed slot means in said annular means, clamp means adjustably mounted on said yoke, said clamp means including a plurality of radially extending means adapted to extend between and communicate with said control means and said helical slot means whereby rotation of said annular means moves said radially extending means relative to said control means and thus moves said yoke axially relative to said assembly.

2. A device of the type claimed in claim 1 wherein said assembly includes means to adjustably fix the canted angular relationship of the yoke relative to said axis.

3. A device of the type claimed in claim 1 wherein at least one of said helical slot means is located in a segment of said annular means which is axially adjustable relative to the remainder of said annular means whereby said clamp and yoke can be adjustably skewed relative to the axis of said cathode-ray tube.

4. A device of the type claimed in claim 1 wherein said arms are provided with mounting means at a point spaced from said body, an apertured workpiece adapted to be accepted by said mounting means for mounting additional components on said workpiece relative to said tube neck.

5. A device of the type claimed in claim 4 wherein said mounting means includes shoulder means at the extremity of each arm, laterally disposed hook means extending outwardly from said shoulder means, said apertures in said workpiece comprising circumferentially disposed slot means including means for cooperating with said hook means to adjustably mount said workpiece juxtaposed to said shoulder means.

6. A device of the type claimed in claim 4 wherein said mounting means includes web means interconnecting the free ends of said arms, fastener means providing abutments in 0pposition to said web means for cooperative mounting of said apertured workpiece in spaced relation to said yoke.

7. A device of the type claimed in claim 1 wherein said means to fix the angular relationship of the yoke includes an adjustably split ring clamp having means to grippingly engage said yoke, said clamp having means adapted to be angularly fixed and axially adjustably relative to said mounting means and thereby control movement of said yoke solely to axial movement relative to said mounting means.

8. A device of the type claimed in claim 7 wherein said clamp means to grip said yoke includes an adjustment means to cause the split ring clamp to close and restrain the yoke against rotation.

9. A device of the type claimed in claim 7 wherein said clamp means to grip said yoke includes an annular inner clamp fixedly mounted in said yoke, an outer clamp encircling said inner clamp and said clamp having cooperative means to permit rotational movement between said clamps but to prevent axial movement therebetween, thereby permitting intended angular adjustment of said yoke.

10. A device of the type claimed in claim 9- wherein said clamp means encircles the waist of said yoke, said inner clamp being a split ring having means to adjust the compressive gripping of said clamp on said yoke, said cooperative means including a plurality of laterally extending tab means circumferentially spaced around said clamp along opposite edges thereof, said outer clamp adapted to be positioned between the tabs extending from the opposite edges of said inner clamp, said outer clamp being split and having means to adjust the compressive gripping relative to said inner ring and thereby control the angular relation therebetween, said outer clamp having a plurality of radially outwardly extending means for cooperative association with said mounting means and adapted to restrain said outer clamp and its associated yoke from rotation relative to said mounting means but to permit axial movement relative to said mounting means.

11. A deflection yoke assembly of the type claimed in claim 1 wherein said mounting means includes an annular nonmagnetic body encircling said yoke, a plurality of circumfere'ntially spaced padlike members extending axially and angularly outwardly from one end of said body and adapted to contact said tube and locate said body relative to said tube, a plurality of circumferentially spaced armlike means extending axially from the opposite end of said body, an annular ring having helically disposed slots therein positioned adjacent and coaxial withsaid arm means and body, axially fixed means extending laterally from said arms and cooperative with said helical slots whereby said ring moves axially relative to said arms when rotated, apertured means traversing one end, and axially fixed and rotatable relative to said ring, said arms cooperable with said apertured means to prevent rotation thereof, means associated with said yoke for mounting same on said apertured means whereby rotation of said ring results in axial but no rotational movement of said yoke.

12. A device of the type set forth in claim 11 wherein said means for mounting said yoke on said apertured means includes slot means for adjusting the angular position of said yoke relative to the axis of said tube.

13. A deflection yoke assembly including magnetic yoke means, means for mounting the yoke relative to the axis of the neck of a cathode-ray tube, means to rotationally adjust said yoke to a fixed angular position relative to said axis, means to axially adjust said yoke relative to said axis, said rotational and axial adjustmentmeans being adapted to maintain said yoke in a fixed angular relationship relative to said axis during all axial adjustment thereof, said mounting means including a nonmagnetic annular ring defining a body adapted to encircle said yoke and having a plurality of padlike members extending axially and diverging outwardly from one end of said ring, said padlike members adapted to contact said cathode-ray tube adjacent said neck and to locate said body in a fixed coaxial relationship relative to said neck, a plurality of circumferentially spaced arm means extending axially from the opposite end of said body, said arm means each including control means ex tending axially therein, said control means each being defined by an axially extending slot which traverses said body and extends a substantial portion of the length of one of said arm means, a nonmagnetic ring including a plurality of circumferentially spaced helically disposed slot means, said ring being adapted to encircle said arm means with the slots in said ring being in communication with the slots in said arm means, means axially spaced along said arms to axially retain said ring in rotatable mounted relation thereon, clamp means encircling said yoke and adjustably fixed relative thereto, said clamp means including a plurality of substantially rigid radially extending means communicating with the control slot means of said arms and the helically disposed slots in said ring, said combination of said radially extending rigid means with the control slots of said arms and said helically disposed slots in the ring defining the means to axially adjust said yoke relative to said axis whereby upon rotation of said ring with its helical slots said substantially rigid radially extending means will be moved axially within the control slots of said arms, said adjustably clamp means encircling said yoke defining the means to rotationally adjust the angular relationship of said yoke relative to said axis and said control slots in said arms maintaining the yoke in fixed angular relationship relative to said axis during axial adjustment thereof.

14. A device of the type claimed in claim 13 wherein said arms at their free extremities spaced from said body are provided with mounting means and an apertured workpiece adapted to be accepted by said am mounting means said workpiece adapted to accept additional electronic components to be maintained relative to said tube neck in axially spaced rclation'to said yoke.

15. A device of the type claimed in claim 14 wherein said mounting means includes shoulder means against which said apertured workpiece abuts and laterally disposed hook means extending outwardly from said shoulder means, said apertures in said workpiece including circumferentially disposed slot means including means for cooperating with said hook means to rotatably and adjustably mount said workpiece juxtaposed to said shoulder means.

16. A device of the type claimed in claim 14 wherein said mounting means includes web means interconnecting the free ends of said arms and fastener means providing abutments in spaced opposition to said web means for cooperative mounting of said apertured workpiece in spaced relation to said yoke.

17. A device of the type claimed in claim 13 wherein said body includes a plurality of circumferentially spaced resilient means which are adapted to bear against the periphery of said yoke and to center said yoke relative to said body whereby location of said body and mounting means relative to said tube neck axis will automatically locate said yoke in predetermined orientation relative to said axis.

18. A device of the type claimed in claim 13 wherein said ring is provided with means to facilitate rotation thereof and at least some of said helically disposed slots having said slots communicating with one edge of said ring, one or more of the balance of the said slots not communicating with the edge of said ring and being adapted to provide access to the means for adjusting theclamp means around said yoke, at least one of said radially extending substantially rigid means having means for adjustably fixing said radially extending means relative to said ring to retain the yoke in fixed axial position.

19. A device of the type claimed in claim 13 wherein said clamp means for encircling said yoke includes an inner clamp fixedly mounted relative to said yoke and an outer clamp encircling said inner clamp and rotatably adjustable but axially fixed relative to said inner clamp, said outer clamp supporting said plurality of radially extending substantially rigid members, at least one of said radial members including adjustable means for cooperating with said ring to adjustably fix said clamp relative to said ring to thereby restrain said yoke against movement.

20. A device of the type claimed in claim 13 wherein said padlike members include on the surface thereof opposite said body an adhesive material to fixedly attach said mounting means on the external surface of the cathode-ray tube adjacent said neck.

2 A device of the type claimed in claim 1 wherein said means for mounting the yoke includes means to permit said yoke to be adjustably skewed relative to the axis of the said cathode-ray tube and to maintain said skewed relation during axial or rotational adjustment of said yoke. 

1. A deflection yoke assembly including a magnetic yoke, means for mounting the yoke relative to the axis of the neck of a cathode-ray tube, means to adjust the rotational angular position component of said yoke relative to said axis, means to axially adjust the axial position component of said yoke relative to said axis, said rotational aNgular and axial adjustment means being adapted to maintain the yoke in a fixed relationship relative to said axis during adjustment of the other components of position thereof, said mounting means including an annular nonmagnetic body and a plurality of pad members symmetrically disposed and extending axially outwardly in diverging relation to one end of said body and adapted to engage and fasten said mounting means to said tube in symmetrical arrangement around the neck of said cathode-ray tube, said means to axially adjust said yoke including a plurality of arms integrally extending from said body in an axial direction opposite said pad members, said arms including axially extending control means, an annular nonmagnetic means rotatably mounted on in juxtaposed relation to said arms and axially fixed relative thereto, a plurality of helically disposed slot means in said annular means, clamp means adjustably mounted on said yoke, said clamp means including a plurality of radially extending means adapted to extend between and communicate with said control means and said helical slot means whereby rotation of said annular means moves said radially extending means relative to said control means and thus moves said yoke axially relative to said assembly.
 2. A device of the type claimed in claim 1 wherein said assembly includes means to adjustably fix the canted angular relationship of the yoke relative to said axis.
 3. A device of the type claimed in claim 1 wherein at least one of said helical slot means is located in a segment of said annular means which is axially adjustable relative to the remainder of said annular means whereby said clamp and yoke can be adjustably skewed relative to the axis of said cathode-ray tube.
 4. A device of the type claimed in claim 1 wherein said arms are provided with mounting means at a point spaced from said body, an apertured workpiece adapted to be accepted by said mounting means for mounting additional components on said workpiece relative to said tube neck.
 5. A device of the type claimed in claim 4 wherein said mounting means includes shoulder means at the extremity of each arm, laterally disposed hook means extending outwardly from said shoulder means, said apertures in said workpiece comprising circumferentially disposed slot means including means for cooperating with said hook means to adjustably mount said workpiece juxtaposed to said shoulder means.
 6. A device of the type claimed in claim 4 wherein said mounting means includes web means interconnecting the free ends of said arms, fastener means providing abutments in opposition to said web means for cooperative mounting of said apertured workpiece in spaced relation to said yoke.
 7. A device of the type claimed in claim 1 wherein said means to fix the angular relationship of the yoke includes an adjustably split ring clamp having means to grippingly engage said yoke, said clamp having means adapted to be angularly fixed and axially adjustably relative to said mounting means and thereby control movement of said yoke solely to axial movement relative to said mounting means.
 8. A device of the type claimed in claim 7 wherein said clamp means to grip said yoke includes an adjustment means to cause the split ring clamp to close and restrain the yoke against rotation.
 9. A device of the type claimed in claim 7 wherein said clamp means to grip said yoke includes an annular inner clamp fixedly mounted in said yoke, an outer clamp encircling said inner clamp and said clamp having cooperative means to permit rotational movement between said clamps but to prevent axial movement therebetween, thereby permitting intended angular adjustment of said yoke.
 10. A device of the type claimed in claim 9 wherein said clamp means encircles the waist of said yoke, said inner clamp being a split ring having means to adjust the compressive gripping of said clamp on said yoke, said cooperative means including a plurality of laterally extending tab means circumferentially spaCed around said clamp along opposite edges thereof, said outer clamp adapted to be positioned between the tabs extending from the opposite edges of said inner clamp, said outer clamp being split and having means to adjust the compressive gripping relative to said inner ring and thereby control the angular relation therebetween, said outer clamp having a plurality of radially outwardly extending means for cooperative association with said mounting means and adapted to restrain said outer clamp and its associated yoke from rotation relative to said mounting means but to permit axial movement relative to said mounting means.
 11. A deflection yoke assembly of the type claimed in claim 1 wherein said mounting means includes an annular nonmagnetic body encircling said yoke, a plurality of circumferentially spaced padlike members extending axially and angularly outwardly from one end of said body and adapted to contact said tube and locate said body relative to said tube, a plurality of circumferentially spaced armlike means extending axially from the opposite end of said body, an annular ring having helically disposed slots therein positioned adjacent and coaxial with said arm means and body, axially fixed means extending laterally from said arms and cooperative with said helical slots whereby said ring moves axially relative to said arms when rotated, apertured means traversing one end, and axially fixed and rotatable relative to said ring, said arms cooperable with said apertured means to prevent rotation thereof, means associated with said yoke for mounting same on said apertured means whereby rotation of said ring results in axial but no rotational movement of said yoke.
 12. A device of the type set forth in claim 11 wherein said means for mounting said yoke on said apertured means includes slot means for adjusting the angular position of said yoke relative to the axis of said tube.
 13. A deflection yoke assembly including magnetic yoke means, means for mounting the yoke relative to the axis of the neck of a cathode-ray tube, means to rotationally adjust said yoke to a fixed angular position relative to said axis, means to axially adjust said yoke relative to said axis, said rotational and axial adjustment means being adapted to maintain said yoke in a fixed angular relationship relative to said axis during all axial adjustment thereof, said mounting means including a nonmagnetic annular ring defining a body adapted to encircle said yoke and having a plurality of padlike members extending axially and diverging outwardly from one end of said ring, said padlike members adapted to contact said cathode-ray tube adjacent said neck and to locate said body in a fixed coaxial relationship relative to said neck, a plurality of circumferentially spaced arm means extending axially from the opposite end of said body, said arm means each including control means extending axially therein, said control means each being defined by an axially extending slot which traverses said body and extends a substantial portion of the length of one of said arm means, a nonmagnetic ring including a plurality of circumferentially spaced helically disposed slot means, said ring being adapted to encircle said arm means with the slots in said ring being in communication with the slots in said arm means, means axially spaced along said arms to axially retain said ring in rotatable mounted relation thereon, clamp means encircling said yoke and adjustably fixed relative thereto, said clamp means including a plurality of substantially rigid radially extending means communicating with the control slot means of said arms and the helically disposed slots in said ring, said combination of said radially extending rigid means with the control slots of said arms and said helically disposed slots in the ring defining the means to axially adjust said yoke relative to said axis whereby upon rotation of said ring with its helical slots said substantially rigid radially extending means will be moved axially within thE control slots of said arms, said adjustably clamp means encircling said yoke defining the means to rotationally adjust the angular relationship of said yoke relative to said axis and said control slots in said arms maintaining the yoke in fixed angular relationship relative to said axis during axial adjustment thereof.
 14. A device of the type claimed in claim 13 wherein said arms at their free extremities spaced from said body are provided with mounting means and an apertured workpiece adapted to be accepted by said arm mounting means said workpiece adapted to accept additional electronic components to be maintained relative to said tube neck in axially spaced relation to said yoke.
 15. A device of the type claimed in claim 14 wherein said mounting means includes shoulder means against which said apertured workpiece abuts and laterally disposed hook means extending outwardly from said shoulder means, said apertures in said workpiece including circumferentially disposed slot means including means for cooperating with said hook means to rotatably and adjustably mount said workpiece juxtaposed to said shoulder means.
 16. A device of the type claimed in claim 14 wherein said mounting means includes web means interconnecting the free ends of said arms and fastener means providing abutments in spaced opposition to said web means for cooperative mounting of said apertured workpiece in spaced relation to said yoke.
 17. A device of the type claimed in claim 13 wherein said body includes a plurality of circumferentially spaced resilient means which are adapted to bear against the periphery of said yoke and to center said yoke relative to said body whereby location of said body and mounting means relative to said tube neck axis will automatically locate said yoke in predetermined orientation relative to said axis.
 18. A device of the type claimed in claim 13 wherein said ring is provided with means to facilitate rotation thereof and at least some of said helically disposed slots having said slots communicating with one edge of said ring, one or more of the balance of the said slots not communicating with the edge of said ring and being adapted to provide access to the means for adjusting the clamp means around said yoke, at least one of said radially extending substantially rigid means having means for adjustably fixing said radially extending means relative to said ring to retain the yoke in fixed axial position.
 19. A device of the type claimed in claim 13 wherein said clamp means for encircling said yoke includes an inner clamp fixedly mounted relative to said yoke and an outer clamp encircling said inner clamp and rotatably adjustable but axially fixed relative to said inner clamp, said outer clamp supporting said plurality of radially extending substantially rigid members, at least one of said radial members including adjustable means for cooperating with said ring to adjustably fix said clamp relative to said ring to thereby restrain said yoke against movement.
 20. A device of the type claimed in claim 13 wherein said padlike members include on the surface thereof opposite said body an adhesive material to fixedly attach said mounting means on the external surface of the cathode-ray tube adjacent said neck.
 21. A device of the type claimed in claim 1 wherein said means for mounting the yoke includes means to permit said yoke to be adjustably skewed relative to the axis of the said cathode-ray tube and to maintain said skewed relation during axial or rotational adjustment of said yoke. 